CVE-2017-8495

high-risk
Published 2017-07-11

Microsoft Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allows an attacker to bypass Extended Protection for Authentication when Kerberos fails to prevent tampering with the SNAME field during ticket exchange, aka "Kerberos SNAME Security Feature Bypass Vulnerability" or Orpheus' Lyre.

Do I need to act?

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16.4% chance of exploitation in next 30 days
EPSS score — higher than 84% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / HIGH complexity

Affected Products (12)

Affected Vendors

Microsoft

References (8)

Third Party Advisory http://www.securityfocus.com/bid/99424
Third Party Advisory http://www.securitytracker.com/id/1038862
Patch https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8495
Third Party Advisory https://www.orpheus-lyre.info/
Third Party Advisory http://www.securityfocus.com/bid/99424
Third Party Advisory http://www.securitytracker.com/id/1038862
Patch https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8495
Third Party Advisory https://www.orpheus-lyre.info/
52
/ 100
high-risk
Severity 22/34 · High
Exploitability 13/34 · Low
Exposure 17/34 · Moderate